Senior Software Engineer

Senior .NET Developer | Up to £75,000 | Hybrid in Oxford

develop is partnering with a well-established, values-led ecommerce business to hire a Senior .NET Engineer who is looking to take the step into a Lead position. The role formalises technical leadership in a small, high-trust engineering team.

The business is mid-way through a major period of change: replatforming, a finance systems transformation, and legacy modernisation and cost optimisation on AWS. You’ll be a key voice in technical decisions, working closely with a CTO-level leader who is consulted on strategy by the senior leadership team.

The role

• Roughly 60% hands-on development and 40% technical leadership. This is not a people-management role
• Stay close to backend development and architecture
• Set and maintain coding standards and engineering best practices
• Lead code reviews across UK and Ukraine-based development teams
• Mentor junior and mid-level developers
• Contribute to architectural decisions and lead proof-of-concept projects
• Support the migration and modernisation of legacy systems into AWS
• Help improve delivery speed, consistency and team performance

The environment

.NET / C#, AWS (ECS, SQS), Docker, microservices, SQL Server and NoSQL, Bitbucket CI/CD, with third-party and ecommerce platform integrations. Upcoming projects include a new pricing engine, order management and fulfilment improvements, with scope to explore AI/ML in pricing.

What we’re looking for

• Strong commercial .NET / C# experience (around 6+ years, though track record matters more than years)
• Strong AWS experience
• Experience building and maintaining microservices
• Good understanding of Docker, containers and modern CI/CD
• Experience with both SQL and NoSQL databases
• A proven record of code reviews and mentoring, with leadership experience either formal or informal
• Collaborative and approachable, with strong opinions held lightly
• Happy to stay hands-on and take ownership

Nice to have:

ECS and SQS, legacy migration, ecommerce integrations, AI/ML exposure.

What’s on offer

• Salary up to £75,000
• Strong benefits package
• Flexible, relaxed working culture (Tues/Wed/Thurs in the office)
• A purpose-led business with a strong charitable focus